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Table 1.
Gaia DR3 members of NGC 6618 with and without spectral classification, sorted by their Ks magnitude.
| Identifier | source_id | Right ascension | Declination | Ks | Spectral type | Ref. |
|---|---|---|---|---|---|---|
| (–) | (–) | (deg) | (deg) | (mag) | (–) | (–) |
| B189a | 4097815274778072832 | 275.1246 | –16.1790 | 5.7 (a) | O4 V | 2 |
| B111 | 4097815382164899840 | 275.1437 | –16.1700 | 7.5 | O4.5 V | 1 |
| B174 | 4097815279085687808 | 275.1268 | –16.1814 | 7.6 | O3-6: V | 2 |
| B358 | 4098003055053984256 | 275.0890 | –16.1665 | 7.8 | post-AGB | 1 |
| 2MASS J18202502-1610261 | 4097815313445442816 | 275.1043 | –16.1739 | 7.9 | – | – |
| B137 | 4097815072927248384 | 275.1378 | –16.1893 | 8.1 | O3-5: V | 2, 3 |
| B164 | 4097815347805170944 | 275.1285 | –16.1688 | 8.8 | O6 V | 1 |
| B181 | 4097815279085690240 | 275.1260 | –16.1764 | 9.0 | O9.7 III | – |
| B289 | 4098003085110461312 | 275.1016 | –16.1454 | 9.2 | O9.7 V | 1 |
| 2MASS J18202656-1610033 | 4098003020694235904 | 275.1107 | –16.1676 | 9.5 | – | – |
| 2MASS J18202528-1610185 | 4098002986334497664 | 275.1054 | –16.1718 | 9.5 | – | – |
| B197 | 4097815244725944064 | 275.1241 | –16.1937 | 9.7 | O9-B1: V | 2 |
| B215 | 4097809163052250624 | 275.1194 | –16.2032 | 10.0 | B0-1 V | 1 |
| 2MASS J18202935-1610559 | 4097815244725950720 | 275.1223 | –16.1822 | 10.1 | – | – |
| B205 | 4097815244725949056 | 275.1215 | –16.1863 | 10.2 | B2: V | 2 |
| 2MASS J18202802-1610589 | 4097815244725953280 | 275.1168 | –16.1830 | 10.2 | – | – |
| B253 | 4097815309143033088 | 275.1085 | –16.1846 | 10.3 | B3-5 III | 1 |
| B136 | 4097815382164903040 | 275.1378 | –16.1704 | 10.4 | O9: V | 2 |
| CEN 55 | 4097815244725951488 | 275.1214 | –16.1817 | 10.4 | early B | 2 |
| 2MASS J18202791-1611087 | 4097815244725951744 | 275.1163 | –16.1858 | 10.6 | – | – |
| 2MASS J18202944-1609394 | 4097815450884394112 | 275.1227 | –16.1609 | 10.6 | – | – |
| B93 | 4097815171704114560 | 275.1484 | –16.1821 | 10.7 | B2: V | 2 |
| B213 | 4098003123773451520 | 275.1195 | –16.1573 | 10.8 | O9-B1: V | – |
| 2MASS J18202622-1610158 | 4097815313445441664 | 275.1093 | –16.1711 | 10.8 | – | – |
| 2MASS J18202622-1609215 | 4098003020694241920 | 275.1092 | –16.1560 | 10.8 | – | – |
| B272 | 4098003020694241024 | 275.1055 | –16.1610 | 10.9 | O9.5: V | 2 |
| B207 | 4097815343502780544 | 275.1203 | –16.1784 | 11.0 | – | – |
| B110 | 4097815171704112256 | 275.1450 | –16.1816 | 11.1 | – | – |
| B234 | 4097815347805176704 | 275.1145 | –16.1704 | 11.1 | – | – |
| 2MASS J18202644-1610135 | 4097815347805179904 | 275.1102 | –16.1704 | 11.1 | – | – |
| B150 | 4097815038567510144 | 275.1327 | –16.1940 | 11.2 | O9-B2: V: | 2 |
| 2MASS J18202396-1610035 | 4098002986334501504 | 275.0999 | –16.1676 | 11.2 | – | – |
| B118 | 4097815382164896896 | 275.1420 | –16.1790 | 11.4 | – | – |
| 2MASS J18202524-1611123 | 4097809437930173440 | 275.1051 | –16.1867 | 11.4 | – | – |
| 2MASS J18202655-1610228 | 4097815313445439872 | 275.1106 | –16.1730 | 11.5 | – | – |
| B86 | 4097815176006461440 | 275.1511 | –16.1820 | 11.6 | – | – |
| B201 | 4097809163052248832 | 275.1225 | –16.2035 | 11.6 | – | – |
| 2MASS J18203109-1609220 | 4097815450884392704 | 275.1296 | –16.1561 | 11.8 | – | – |
| B56 | 4097815210366202240 | 275.1593 | –16.1690 | 12.5 | – | – |
| 2MASS J18202007-1609557 | 4097815450884392704 | 275.1296 | –16.1561 | 12.5 (b) | – | – |
| 2MASS J18203617-1611460 | 4097815004207762944 | 275.1507 | –16.1961 | 13.4 (b) | – | – |
| 2MASS J18204388-1611236 | 4097814381430170496 | 275.1828 | –16.1899 | 14.1 (b) | – | – |
Notes.
References. (1) Ramírez-Tannus et al. (2017); (2) Hoffmeister et al. (2008); (3) Povich et al. (2009).
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